Synthesis and Characterization of Easily Colored Meta-aramid Copolymer Containing Ether Bonds

Li, Na; Zhang, Xingke; Yu, Junrong; Wang, Yan; Zhu, Jing; Hu, Zuming

doi:10.1007/s10118-019-2200-9

Cited by 14 publications

(7 citation statements)

References 27 publications

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“…Several polymeric analogues were synthesized using the conventional methodology, − utilizing different reaction conditions and various diamines and diamine combinations. The objective in studying different amines was twofold: increased solubility of the resulting polymer would prevent its premature precipitation, which essentially terminates the chain growth, and the resulting polymer would be soluble in solvents other than sulfuric acid to enable GPC characterization.…”

Section: Resultsmentioning

confidence: 99%

Kevlar-like Aramid Polymers from Mixed PET Waste

et al. 2022

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This work describes the synthetic approaches, spectroscopic and thermal characterization of aramid polymers prepared from waste polyethylene terephthalate (PET) via sustainable and scalable processes. Direct depolymerization of PET with aliphatic diamines under melt conditions resulted in decomposition without substantial formation of any aramid polymer. The Higashi–Ogata methodology or direct polycondensation of terephthalic acid (TPA) derived from PET waste and p -phenylenediamine, resulted in oligomerization and formation of aramids with a low degree of polymerization. The highest molecular weight polymers were obtained via the acid chloride of TPA, the traditional method. A proprietary solvent enabled the dissolution of most polymers and subsequent size exclusion chromatography analysis in the same solvent. We emphasize that although the soluble polymer compounds are prepared via the traditional route, they are novel. The apparent molecular weights of the soluble polymers ranged between 10–35 kDa ( M n ) and 28–81 kDa ( M w ). All analogues were prepared with commercially available diamines and diamine combinations. The obtained solid powders were dissolved in D 2 SO 4 and analyzed spectroscopically to qualitatively evaluate the degrees of polymerization, while the solids were characterized via thermogravimetric analysis and differential scanning calorimetry. Many reaction conditions were employed to improve the solution polycondensation reaction, and it was found that addition of pyridine (2 eq) to the NMP reaction medium was crucial in preventing the precipitation of the polymer. Contrary to conventional wisdom, CaCl 2 did not play a crucial role in the molecular weight increase of the polymer when oxydianiline was used. Our data indicated that the temperature and absence of CaCl 2 provided a boost in molecular weight. Both room temperature and 0 °C reactions generated similar polymers as suggested by nuclear magnetic resonance; however, the cold conditions enhanced gel formation, an important attribute in the future processing of these materials to obtain fibers. All analogues had a high degradation temperature at 5 and 10% weight loss ( 5% and T 10% ), above 400 °C, along with high percent char values. A glass transition ( T g ) was not detected in any of the analogues prepared.

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Section: Resultsmentioning

confidence: 99%

Kevlar-like Aramid Polymers from Mixed PET Waste

et al. 2022

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“…In recent years, colored polymer has been widely concerned due to their good application prospects in many fields . Generally, colored polymer is obtained by physically mixing dyes with polymeric matrices.…”

Section: Introductionmentioning

confidence: 99%

Waterborne polyurethane‐based dye with covalently bonded to Disperse blue 60

Xian

et al. 2019

J of Applied Polymer Sci

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A series of sulfonated waterborne polyurethane-based dyes (DB60-SWPUs) with covalently bonded to different proportions of Disperse blue 60 (DB60) were prepared by a modified acetone process. The expected structures of DB60-SWPUs are characterized by Fourier transform infrared spectroscopy and 1 H-NMR spectra. The obtained DB60-SWPUs show high viscosity and intriguing storage stability. The fluorescent performances, thermal properties, and mechanical properties of DB60-SWPUs were characterized. Compared with DB60, the UV-vis spectra of DB60-WPUs have obvious hypochromic shift, and the fluorescence intensities are obviously enhanced. The migration rates of DB60-SWPUs are much lower than that of DB60. DB60-SWPUs have thermal migration resistance and excellent color fastness. The polyester fiber dyed by DB60-SWPUs has not only high color yield, good fracture strength, excellent breaking strength retention, but also good permeability and wrinkle resistance. Moreover, DB60-SWPUs are polymeric dyes with water as a solvent, which are especially suitable for environmental protection.

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“…In recent years, monomers containing ether bonds have been used in the study of copolymerization with PMIA. [22][23][24] It was found that the introduction of ether bonds into the aromatic polyamide backbone can greatly reduce the molecular chain regularity and crystallinity of the polymer. These results may be attributed to the different average intermolecular distances caused by ether bonds; that is, the flexible internal rotation facilitates the migration of segments.…”

Section: Introductionmentioning

confidence: 99%